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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Developmental Biology

Background:

  • Death-associated protein kinase 3 (DAPK3) is a serine/threonine kinase implicated in tissue homeostasis.
  • DAPK3 is a putative tumor suppressor, but its mechanisms and a relevant mouse model are lacking.

Purpose of the Study:

  • To investigate the tumor-suppressive function of DAPK3 using in vitro and in vivo models.
  • To generate and characterize a constitutive DAPK3-knockout mouse model.

Main Methods:

  • Utilized a 3D tumorigenesis model with lentiviral-mediated DAPK3 knockdown.
  • Generated a constitutive DAPK3-knockout mouse via gene trap strategy.
  • Analyzed DAPK3 expression in clinical breast cancer specimens using the Oncomine database.

Main Results:

  • DAPK3 loss in 3D models increased acinar size, proliferation, and apoptosis, enhancing mTOR activation.
  • DAPK3-depleted structures showed sensitivity to rapamycin, with RAPTOR knockdown reversing effects.
  • DAPK3 is essential for early mouse development, with its promoter active in developing and adult breast tissues.
  • Reduced DAPK3 expression correlates with ductal carcinoma in situ and aggressive breast cancer.

Conclusions:

  • DAPK3 functions as a tumor suppressor through pathways involving mTOR signaling.
  • DAPK3 is critical for mammalian development and its dysregulation is linked to breast cancer progression.